Process of treating or impregnating planté negative plates.



' State of insrrn FEICE. 7

HUGE RODMAN, 0F IPITTSBURG, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN- MEETS, T0 WESTINGHOUSE STORAGE BATTERY COMPANY, A CORPORATION OF NEW YORK.

FROCESS OF TREATING 0R IMPREG-NATING PLANTE NEGATIVE PLATES.

No Drawing.

To all whom it may concern:

Be it known that I, HUGH RODMAN, a citizen of the United States, and aresident of Pittsburg, in the county of Allegheny and ennsylvania, have made a new and useful Invention in Processes of Treating or Impregnating Plant Negative Plates, of which the following is a specification.

Plant negative pole plates for use in storage batteries are in many respects superior to pasted negative poleplates. Their use,

however, has been limited because of the gradual shrinkage and the loss of initial capacity of the active material; a fault overcome in pasted plates bythe mechanical admixture of a so-called expander This invention relates to Plant negative pole plates and to a method of impregnating negative pole plates so that the pores of the active mass, or the mass to become active, of such plates contain an expander 1n the form of finely-divided, inert, insoluble substances placed therein after the formation of said pores.

The impregnation is preferably carried out by soa ing the plates in one solution and subsequently in a second solution, the two solutions reactin -chemically .to produce an insoluble, finely-divided substance within the pores of the active mass or the mass to become active.

One method of obtaining the desired impregnation consists in dipping the dried plates either finished or in. course of manufactured into a solution of a soluble salt of the strontium barium group, such as barium nit-rate (preferably a saturated solution) and subsequentlyinto a dil te solution of a solvi- Plant negative plates, which consists in.

ble sulfate, such as sul. uric' acid or sodium sulfate, thus precipitating by the chemical reaction barium sulfate in a finely-divided state in the pores of the mass.

Having now particularly described and ascertained the nature of my invention and in what manner the same may be performed, I declare that what I claim is: I

1'. The method of reducing depreciation in impregnating the active mass or mass to become active, with a compound'of the barium group.

2. The method of reducing depreciation in Plant negative plates, which consists in impregnating the active mass, or the mass Specification of Letters Patent.

Application filed. March 24, 1906 Serial No. 307,929.

Patented me. as, icon.

'to become active, with an inert finely di- Plant ne ative plates, which consists in impregnating, the active mass, or the mass to become active, with a finely divided sulfate-of the barium group.

4. The method of reducing depreciation in Plant negative plates, which consists in impregnating the active mass, or the mass to become active, with finely divided barium sulfate.

5. The method of reducing depreciation in Plant negative plates, which consists in precipitating within the active mass, or the mass to become active thereof, a finely olivided inert compound of the barium group.

6. The method of reducing depreciation in Plant negative plates, which consists in precipitating within the active mass, or the mass to become active thereof, a finely divided inert-barium compound.

7 The method of reducing depreciation in Plant negative plates, which consists in precipitating within the active mass, or mass to become active thereof, a finely divided sulfate of the barium group.

8. The method of reducing depreciation in Plant negative lates, which consists in precipitating within the active mass, or mass to become active thereof, finely divided barium sulfate.

9. The method of reducin depreciation in Plant negative plates, w ich consists in impregnating the active mass, or the mass to become active thereof, with a solution of a substance and subsequently treating the mass with a. chemical reagent to deposit in de osit within the active mass an inert inso uble substance. 1

11. Themethod of reducing depreciation -in Plant negative plates, whlch consists in impregnating the active mass, or the mass to become active thereof, with a soluble barium compound and subsequently treating the mass with a chemical reagent which react-S moisteuing the active mass, or mass to be"- 'rying active material impregnated with a the barium. compound to deposit witl1- pores oi 'the active mass an inert finely divided insoluble substance.

12. The method oi? reducing depreciation batteries, which consists in im pregnatlng the active mass or the mass to become active thereof, with a solution of a substance and subsequently treating the mass with a fluid reagent to deposit within. the pores of the active mass an inert insoluble finely divided substance. v

13. 'l." e method of reducing depreciation in nega electrodes of lead storage loatteries, which consists in precipitating within the active mass or the mass to become ac tive th roof, a finely divided insoluble cointhe barium group. p i he method of reducing depreciation irage batteries, which consists in ng within the active nass,'or mass active, a finely divided insoluble oinpound. I

e method of reducing depreciation storage batteries which consists in pirating within the active mass,. or the 0 become active, finely divided barium G. 16..The method of reducing depreciation in lead storage batteries, which consists in precipitating within the active mass, or the mass LO become active, of the negative electrodes a finely divided sulfate of the barium group.

The method of reducing depreciation in lead storage'batteries, which consists in treating the active mass, or the mass to belve, of the negative electrodes, with l solutions which eventually precipitate with-' in the mass finely divided sulfate of the barium group.

18. The method of reducing depreciation in lead storage batteries which consists in. treating the active mass, or the mass to become active, of the negative electrodes with solutions which eventually precipitate within the mass finely divided barium sulfate.

19. The method of reducing depreciation in storage batteries which consists in treating the ne ative pole lates carrying a porous mass with two so utions which eventually precipitate within the pores of the mass a finely divided, inert, insoluble substance.

20. The method oireducing depreciation in Plant negative plates which consists in come active, with solutions which eventually precipitate within the pores of the mass finely divided sulfate of the barium group.

21. l i Plant formed negative plate car-' divided barium sulfate.

22? Plant formed negative plate caractive material impregnated with a divided sulfate of the barium group. A lPlant fora-led negative plate carfinely rying I"; nely ceases substanceby a chemical reagent while with-.

in the pores thereby depositing such insoluble inactive material.

26. The process of treating plates to be used as negative pole plates which consists in soaking the plate in a solution of a substance capable of penetrating the pores and of forming by the action of an appropriate chemical reagent a deposit of an insoluble inactive substanceand then removing the plate and subjecting the plate to the action of said reagent thereby'causing the formation of such insoluble inactive substance within the pores.

27. The process or" treating plates to be used as negative pole plates which consists in soaking the previously formed plate in a solution oi a substance capable of penetrating the pores and of forming with the aid of a suitable chemical reagent, an insoluble deposit of inactive material and subsequently removing the plate from the solution and exposing the plate to the action of said reagent and thereby producing within its pores deposits of insoluble inactive material.

28. The process of treating plates for use as negative pole plates after forming which consists in precipitating in the pores of the plate by the reaction of two solutions insoluble, inactive material in a finely divided state.

29. The process of treating plates carrying a porous active mass to be used as negf asnegative pole plates characterised by the' step of soaking the plate and impre nating its pores with a solution of a substance capable of producing with the aid of an appropriate chemical reagent, an inert mate rial in said pores.

31. The process of treating plates for use as negative pole plates characterized by the step of soaking the plate in and impregnating its pores with. a solution of a substance capable of o'ducing with the aid of an appropriate ch. mical rea out an inert material inthe saidl h s and y the further in soaking the previously formed plate in a solution of barium nitrate.

In testimony whereof, I have hereunto subscribed my name this 22nd day of March,

step of subjecting such material While in the pores to the reagent and thereby producing within the 'pores an inert material.

32. The method of treating plates to be 5 used as negative pole plates which consists in soaking the previously formed plate in a solution of a soluble salt of the strontium HUGH RODMAN' barium group. WVitnesses:

33. The method of treating plates to be CHARLES W. MoGHEE, 10 used as negative pole plates which consists E. W M

. CGALLISTER. 

